Paper-making machines



Slept. v9, 1958 H HOLDEN 2,850,951

PAPER-MAKING MACHINES FileqAMay 20, 1954 5 sheets-sheet 1 l nventorHerberz HQ/de Sept.4 9, 1958 H. HOLDEN 2,850,951

PAPER-MAKING MACHINES Filed May 2o, 1954 l5 sheets-sheet 2 Inventurttorney Sept. 9, 1958 H. HOLDEN PAPER-MAKING MACHINES Filed May 2o, 19545 Sheets-sheet :s

ibi I? 950 Herbal?? bro/den By Wr Y h- Attorney Sept. 9, 1958 l H.HOLDEN 2,850,951

' PAPER-MAKING MACHINES Filed May 2o, 1954 5 sheets-sheet 4 Herbert denA (torn ey sept. 9, 195s H. HOLDEN 2,850,951

PAPER-MAKING MACHINES Filed May 2o, 1954 5 sheets-sheet 5 l InventurUnited StatesvPatent O PAPER-MAKING MACHINES Herbert Holden, Sheffield,England, assignor to Beloit Iron Works, Beloit, Wis., a corporation ofWisconsin This invention relates to paper-making machines of theFourdrinier type in which the paper web is taken from the forming wireby a vacuum pick-up roll and thereafter transferred to the press sectionof the machine.

In some machines, the vacuum pick-up .roll (operating within a transferfelt) is the lowermost roll of a stacked press, at the upper rolls ofwhich the web is subjected to pressing and transferred to the upper sideof a felt by which it is progressed further through the machine. Inother machines, the web is carried on the underside of the transfer feltto which'it has been taken 'from the forming wire by the vacuum pick-uproll, and meets a bottom felt at `or somewhat before reaching the nip ofa transfer press consisting of a bottom suction roll and a top pressroll, and substantially removed in space from the pick-up roll. As itsname indicates, this press serves primarily for the transfer of the webto the upper side of the bottom felt, andfurther pressing is effected ata separate press to which the web is carried by the bottom felt, withstill further pressing effected subsequently if desired. i

The present invention is concerned with'a modification of the second ofthe vacuum pick-up arrangements described above, and is directed to asimplification of the main essential mechanism, and to the improvedsupporting of the web removed from the wire.

According to the present invention, a Fourdrinier paper-making machineof the type in which la lsuction pick-up co-operates with the formingwire in the vicinity of the couch roll to remove the paper web, and abottom felt is provided to carry the web to a press, comprises a suctiontransfer roll disposed near to the suction pickup roll o-n the side ofthe pick-up roll remote from the couch roll, an lendless bottom transferlfelt passing round the transfer roll, an endless permeable pick-upmedium passing round the pick-up roll, and a guide roll to cause thepick-up medium to curve round part of the transfer roll onpleaving thepick-up roll, and .then to diverge from the transfer felt when the weband the felt have left the transfer roll.

When the web has Ibeen removed yfrom the wire by the pick-up roll, it iscarried by the pick-up medium into contact with the transfer felt overthe arc of .the transfer roll round which the pick-up medium curves, andsuction applied by the transfer roll causes the web to leave the pick-upmedium and remain on the upper side of the transfer felt as the pick-upmedium and the felt diverge. The web thus becomes supported by thetransfer felt very soon after it has been removed by the .pick-up rollfrom the wire; and, being applied to the transfer felt close to thepick-upy point, it may be carried by that felt direct to a press, atransfer press being rendered unnecessary.

Th-e transfer roll may be so positioned as to form a nip with thepick-up roll, with the pick-up medium and the transfer felt (and the webbetween them when the machine is in operation) interposed between them.Such nip is not intended for material expression of water, but mainly toassist in the transfer of the web, forwhich purpose the pressure betweenthe rolls is only comparatively light, say not exceeding 40 lbs. perlinear inch.

Alternatively, there may be a gap between the pickup roll and thetransfer roll, which gap is bridged vby the pick-up medium'as it leavesthe pick-up roll to meet the transfer felt at the transfer roll. The webis then subjected to pressure exerted solely by the arcs ofthe pick-upmedium and the transfer felt round the transfer roll, sufiicientexibility being provided to pass lumps and variations in thickness orcreases in the felt without the same likelihood of damage that mightarise in' passage through a positive nip between the two rolls.

The pick-up medium may,` be an endless felt. It is, however, animportant advantage of the invention that an endless pick-up wire may beused, where the paper is of a quality which is no detriment to have twowire sides. The useof a pick-up wire, with its open texture, avoids thecleaning diculties encountered with a transfer felt.

The endless wire may be inserted by methods generally analogous to thoseused for the insertion of the endless forming wire at the wet end of themachine, several alternative methods Ibeing described below.

The invention will now be ldescribed in greater detail with reference tothe accompanyingdrawings, in which Figure 1 is a side elevation, partlyyin section, ofthe pick-up and first press section of .a machine withatransfer roll disposed as shown in the -diagrammatic Figure 7;

Figure 2 corresponds to part of Figure l, and shows the disposition ofthe machine parts for wire changing, the old wire removed and new wirein place for installation, with special equipment for the purpose; l f

Figure 3 shows the special equipment of Figure 2 ready to receive thetransfer wire from the side of the machine; -f

Figure 4 is a section taken on the line 4-4 of Figure 3, with partsbroken away; n

Figure 5 corresponds to Figure 2, but shows modified pick-up rollmechanism and alternative `disposition of machine parts for wirechanging and other special equipment;

Figure 6 again corresponds to Figure 2, but `shows Ifurther modifiedpickup rmechanism and wire changing disposition and equipment; and

Figures 7 to 18 show diagrammatically various dispositions of pick-uproll and transfer roll in relation to each other and to the couch roll(in some instances with a forward drive roll for the forming wire),Figure 7 being the disposition shown in Figures 1, 5, and 6.

In Figure 1, a suction transfer roll 20 is mounted in fixed bearings ina housing 21 beyond a forward drive roll 22 for the forming wire 23beyond the couch roll 24.y A transferfelt 25 passes substantiallyvertically (at 26) to the side of the transfer roll 20 nearest to theforward drive roll 22, and from the transfer roll it passes upwardly ata slight incline to the nip of a suction press comprising a bottomsuction roll 27 and a plain press roll 28. Leaving the nip, the felt 25returns via guide rolls 29 and stretching and cleaning devices'30, 31 tothe transfer roll. A savefall tray 32 may Ibe disposed lbelow thetransfer roll, as shown in-Figure 7; alternatively, with no`tray, thefelt may return horizontally to the roll, as shown at 33 in Figure 9.

A suction pick-up roll 34 is carried in a pair of arms 35 (one onlyshown) pivoted at 36 lintermediately of ltheir length on a lcam shaft37, rotation of which by racks 38 and pinions 39 operated by aircylinders 404er the like provides` for. quick lifting of the roll 34from l contact with the run 4,1 of the wire 23 between the couchPatented Sept. 9, 1958 3 roll 24 and the forward drive roll 22. Theupper ends 42 of the arms 35 are urged by air cylinders 43 or the liketo provide an adjustable nip with the rubber covered transfer roll 20,which nip need not be broken by the quick lift of the pick-up roll fromthe wire on operation of the cylinders 40.

An endless pickup wire 44 passes downwards to the side of the pick-uproll 34 nearest the couch roll 24, under the pick-up roll 34, and overthe transfer felt 25 on the transfer roll 26. Diverging at 45 from thetransfer felt, the pick-up wire 44 passes a cleaning spray 46 and tray47 to a stretch roll 48 on arms 49 pivoted at 50 and loaded by springs51, and thence by guide rolls 52 to the pick-up roll 34. Y

The pick-up roll 34 has its internal suction box of usual constructionsealed to the inside of the perforated shell 53, of the roll to providea mouth 54 extending over a short arc from approximately the firstmeeting of the pick-up wire 44 with the forming wire run 41. This arc isfollowed by a further suction-box mouth arc 55 extending to the point atwhich `the pick-up wire 44 is about to leave the pick-up roll 34. Thissecond arc 55 may be supplied with a lower degree of suction, to keepattached to the picloup wire the web of paper already removed from theforming wire run 41 with the aid of higher suction at the first arc 54,and to prevent water entrained in the holes of the shell 53 being thrownback into the pick-up wire and web.

The transfer roll 20 has a compartment 56 in its suction box, sealed tothe inside of the perforated metal shell 57 of the roll to provide amouth extending over an arc from approximately the first contact of thetransfer felt 25 with the perforated rubber cover 58 and the paper webwith the pick-up wire 44 to near the point 45 at which the transfer felt25 and the run 41 of the pick-up wire begin to diverge, thus ensuringtransfer of the web to the felt 25. When, however, the machine isarranged with a definite nip between the rubber covered transfer roll 20and the pick-up roll 34 (see Figures 1, 2, 5, 6, 7, 8, l1, l2, l5, and16), a further compartment 56A may also be provided at the inlet side ofthe nip to remove any expressed water.

The arc of contact of the pick-up wire 44 over the transfer roll 20 isdetermined by the position of the stretch roll 48. There may, however,be an auxiliary guide roll 59 (Figure 9) between the transfer roll 20and the stretch roll 48, and close to the transfer roll, to control thisarc.

The paper web (which the drawings do not attempt to show) follows asinusoidal path from the point at which it is removed from the formingwire run 41 to the point at which it has left the pick-up wire run 41for the transfer felt run 25, i. e., in an arc convex downwardly as itpasses round the pick-up roll 34 and then in an arc of reverse curvatureas it passes round the transfer roll 20, This form of path results withvarious relative height dispositions of the axes of the couch roll, thepick-up roll, and the transfer roll. In general, the pick-up roll, lessin diameter than the couch roll, has the lowermost part of its surfaceat approximately the same height as ythe axis of the couch roll, but itmay be above or below this height. Figures 7 to 18, to be describedlater, show the pick-up roll in various relationships to the couch rolland the transfer roll.

Worm and screw-and-nut gear 60, 61, operated by handwheel 62, isconnected to the upper ends 42 of the pick-up roll arms 35 (afterdisconnection of the cylinders 43: see Figure 2) to swing the roll 34well clear of the forming wire run 41'for changing of the pick-up wire44. The rolls 52 are supported by beams 63 on pedestals 64 includingremoval pieces 65 from side frames 66 of the press section (see Figurel; also Figure 4). The beams 63, connected by crossbeams 67, also carrythe gearing 60, 61, 62 for the arms 35, and `disconnectible gearing 68,69 for the loading spring 51 of the stretch roll 48. For wire-changing,the weight on the beams 63 is taken by beams 70 inserted into themachine, after the pick-up roll 34 has been swung upwardly, the loosepieces 65 removed, and the stretch roll 48 detached from its arms 49 andlaid behind brackets 71 on the beams 63. The beams 70 rest at one end ontie beams 72 between the beams 67; their other ends extend across theaisle alongside the machine, where they are supported on a frame 73(Figure 4), the beams 67 then not being supported wholly by the machineframe, but with the beams 70 providing a continuous support from theframe 73 across the aisle and through the machine to the farther sideframe 66A of the machine. The beams 70 are brought into position bysuspension cables 74 from a crane or run-ways.

Between the frame 73 and the nearer side 66, two pairs of pedestals 75,76 provide a support for a frame 77 having brackets 78 to receive poles79 round which the new pick-up wire 44A is draped. Initially, the poles79 are compactly disposed in brackets 80 and on crossmembers 81, allwell within the compass of the frame 77. The beams 70 are insertedthrough the wire, and supported as previously described. The poles 79are then transferred to the brackets 78, so that the wire 44A is drapedaround five poles (Figure 2).

The frame 77 is then lifted by a crane clear of the pedestals 75, 76(Figures 3 and 4) and carried from the aisle across the machine, when itis lowered on to supports 82 (Figure 2), the draped wire passing roundthe whole of the mechanism supported by the beams 67, 70. The wire 44Ais then taken from the poles 79, and the frame 77 is removed, for themachine mechanism to be restored to its original position, the beams 70being removed after'replacement of the removable parts 65.

In Figure 5, instead of the pick-up roll being quickly lifted, as inFigure l, the forward drive roll 83 may be quickly lowered as shown at83A to break the contact between the forming wire run and the pick-uproll 34. On starting up the machine and when a break occurs, thc driveroll is raised to control the lap of the wire run -41 round the roll 34.The nip of the pick-up roll 34 and the transfer roll 20 is controlled bycylinders 84, the roll arms 85 being pivoted at 86. Upon disconnectionof the cylinders S4, the pick-up roll 34 may be lifted by a crane untilnotches 87 in the arms 85 are engaged by automatic stops 88. The stretchroll 89 is carried by a slide 90, which may be moved along support beams91 to the position shown at 90A. The beams 91 may then be supported inthe manner described with reference to Figures l to 4, for theapplication of a new wirc 92 draped on a frame 93 similar to the frame77. It is not necessary to lower the roll 83 for changing of the wire92.

In Figure 6, which again shows a forward drive roll 94 adapted to belowered (94A) to break contact between the forming wire run 41 and thepick-up roll 34, the pick-up arms 95 are pivoted to allow the pick-uproll to be raised into line with a cantilever frame 97 at the rear ofthe machine, one arm being capable of being divided by removal of a part96 to enable the roll 34 and the remaining part 95A of that arm to bedetached from the main part of the arm. The arms 95 can be discon nectedfrom their loading cylinders 95B and swung so that a locking pin may beinserted in holes 95C, 95D in the arms and machine frame respectively,which brings the roll 34 to the position Vshown in chain lines. ln thisposition, one end of the roll 34 may be supported by a beam 97Acantilevered from the frame 97, after which the part 96 may bc removedto divide the arm 95. The stretch roll 98 and guide rolls 99 aresimilarly taken to the frame -97 and attached to it by one end. Therolls thus cantilevered from the frame lie opposite a new wire 100draped from poles 101 carried by a frame 102 from a runway or crane. Thebeam 97A is threaded through the wire vand into engagement with the roll34 before the arm 95 is divided. The wire is then carried inwards by theframe 102 over the rolls 34, 98, 99, after which the part 96 isre-inserted in the arm 95 and the beam 97A is removed. The wire may nowbe completely unrolled, the rolls 9S, 99 being returned to their workingpositions and the arms 95 swung until the cylinders 95B can bereconnected.

The pick-up roll is preferably positively driven, for example by meansof a self-contained motor movable with the roll. Again, it may be driventhrough a flexible coupling allowing sufficient movement for thequick-lift of the pick-up roll itself (where provided, as in Figures 1and 2) and capable of being disconnected for Athe substantial movementof the roll required in wirechanging. Yet again, the pick-up roll may bedriven from a shaft co-axial with the transfer roll through toothedgearing capable of swinging with the pick-up roll Without coming out ofmesh during the relatively small quick lift. y

Figures 1, 5, and 6 show the diameter of the transfer roll 20 to ibeapproximately equal to (actually. slightly less than) that of the couchroll 24. In Figures 7 to 18, its diameter lies more nearlyintermediately between those of the couch roll and the pick-up roll 34.In other respects, Figure 7 corresponds to Figures l, 5, and 6.

Considerable latitude is possible in the respective heights of the axesof the pick-up roll 34, the transfer roll 20, and the couch roll 24.Variations in these respective heights and other possible varations inthe pick-up and transfer arrangements are shown in Figures 7 to 18, someof which show the pick-up taking place at the couch roll, instead offrom a run of the forming wire between the couch roll and a forwarddrive roll.

f' Figure 7 calls forno further description, since it generallycorresponds to Figures 1, 5, and 6, except to point out that it showsthe axis 103 of the transfer roll 20 substantially below the level ofthe axis 104 of the pick-up roll 34.

In Figure 8, the axis 103 is at nearly the same height as the axis 104,kand this provides greater clearance 105 between the forward drive roll22 and the upward run 106 of the transfer felt, which run may departmore from the vertical to increase this clearance still further.

Figure 9 differs from Figure 7 principally in having the pick-up roll 34and the transfer roll 20 sufficiently clear of each other by a gap 107to avoid a direct nip. The wire 44 has a run 108 between leaving ytheroll 34 and meeting the felt 25 at the roll 20, thus bridging the gap107. The suctionbox mouth 109 of the roll 20 is narrower in consequence.An auxiliary guide roll 59 serves to control the length of arcuatecontact of the wire run 45 with the roll 20.

Figure l0 generally resembles Figure 9, lbut has the transfer roll axis103 nearly level with the pick-up roll axis 104.

Figure 1l shows the wire 44 first passing over an advance guide roll 110before reaching the pickup roll 34 (as described in U. S. patentapplication Serial No. 420,132 of Herbert Holden, entitled Paper-MakingMachines, filed March 31, 19.54) the guide roll and the pick-up rollboth lying `clear of the couch roll 24 of the forming wire by an amountgreater than the thickness of the pick-up wire 44 to provide that astraight line tangential to the other wire surface at both rolls 110 and34 would, for a portion of its length, form a chord of the circleprovided by the lap of the forming wire 23 round the couch roll 24. Thispermits lumps in the paper web to pass, likewise any variation inthickness of the wire 44, with less likelihood of damage to the web. Thecouch roll 24 has a suction box mouth 111 extending into the overlap ofthe pick-up wire 44 and the .forming wire 23 for the removal ofexpressed water. This is followed by a` further month 112 for a ow ofpressure air from within the roll 24 to assist in the removal of the webfrom the forming wire 23 just in advance of the first contact of thepick-up wire 44 with the pick-up roll 34.

Figure 12 is similar to Figure 11 in having the advance guide roll 110,but the transfer roll axis 103 is nearly level with the pick-up rollaxis 104.

Figures 13 and 14 resemble Figures l1 and l2 respectively, but also havethe gap 107 between the pick-up roll 34 and the transfer roll 20,bridged by the run 108 of the transfer wire 44, thus avoiding fa directnip at either pick-up or transfer. Again, an auxiliary guide roll 59 isused to control the transfer wire run 45.

Figures 15 and 16 show the advance guide roll 110 used in conjunctionwith pick-up from the forming wire run 41 between the couch roll 24 andthe forward drive roll 22, Figure 16 with its raised transfer roll axis103 being preferable when possible, because of the wider gap 105 betweenthe roll 22 and the upward run 26 of the transfer felt 25.

Figures 17 and 18 resemble Figures 15 and 16, but also have the gap 107between the pick-up roll 34 and the transfer roll 20, bridged by the run108 of the transfer wire 44. As with Figures 13 and 14, there is nodirect nip at either pick-up or transfer. The auxiliary guide roll 59controls the transfer wire run 45.

Whatl claim is:

l. A Fourdrinier paper-making machine comprising a couch roll, a formingwire passing over the couch roll, a suction pick-up roll mountedadjacent to the couch roll, an endless permeable pick-up medium broughtinto contact with the forming wire bythe pick-up roll, a suctiontransfer roll adjacent the pick-up roll on the side of the pick-up rollremote from the couch roll, a press, an

endless bottom felt passing around the transfer roll and to the press,said pick-up roll being provided with a suction box, said pick-up mediumand said felt beyond the diverging point having unsupported `lengthsyextending to and around auxiliary stretch rolls.

2. A Fourdrinier paper-making machine comprising a couch roll, a formingwire passing over the couch roll, a suction pick-up roll mountedadjacent to the couch roll, an endless pick-up wire brought into contactwith the forming wire by the pickup-roll, a suction transfer rolldefining a nip with the pick-up roll on the side `of the pickup rollremote from the couch roll, an endless bottom transfer felt passingthrough the nip of the two rolls, said pick-up roll causing said pick-upmedium to contact said forming wire and then pass into contact with thebottom felt on the transfer roll substantially immediately on leavingthe pick-up roll, said pick-up roll being provided with a suction boxextending substantially from the first point of contact of the pick-upmedium with the forming wire to the first point of contact of thepick-up medium with the bottom transfer felt on the transfer roll, theguide roll being positioned to Icause the pick-up kmedium to curvearound part of the transfer roll substantially immediately on leavingthe pick-up roll and then to diverge from the transfer felt when the weband the felt have left the transfer roll.

3. A Fourdrinier paper-making machine comprising a couch roll, a formingwire passing -over the couch roll, a suction pick-up roll mountedadjacent to the couch roll, an endless permeable pick-up medium broughtinto contact with the forming wire by the pick-up roll, a suctiontransfer rollforming a nip with the pick-up roll on the side of thepick-up roll remote from the couchroll, a stretch roll for the pick-upmedium, said pick-up roll being provided with a suction boxvextendingsubstantially from the first point of contact` of the pick-up mediumwith the forming wire to the first point of contact of the pick-upmedium with the bottom transfer felt on the transfer roll, the guideroll being positioned to cause the pick-up medium to curve around. partof the transfer roll substantially immediatelyron leavingthe pick-uproll 7 and then to diverge from the transfer felt when the web and thefelt have left the transfer roll.

4. A Fourdrinier paper-making machine comprising a couch roll, a formingwire passing over the couch roll, a suction pick-up roll and an advanceguide roll mounted adjacent to the couch roll but spaced from theforming wire at the couch roll, an endless pick-up medium passing aroundthe guide roll and the pick-up roll and brought into contact with theforming wire between them, a suction transfer roll adjacent the pick-uproll on the side of the picloup roll remote from the couch roll, anendless bottom transfer felt passing around the transfer roll, saidpick-up roll being provided with a suction box extending substantiallyfrom the rst point of contact of the pickup medium with the forming wireto the first point of contact of the piek-up medium with the bottomtransfer felt on the transfer roll, the guide roll being positioned tocause the pick-up medium to curve around part of the transfer rollsubstantially immediately on leaving the pickup roll and then to divergefrom the transfer felt when the web and the felt have left the transferroll.

5. A Fourdrinier paper-making machine comprising a couch roll, a forwardroll, a forming wire passing over the couch roll and the forward roll, asuction pick-up roll, an endless pick-up medium brought by the pick-uproll into contact with the forming wire between the couch roll and theforward roll, a suction transfer roll defining a nip with the pick-uproll on the side of the pick-up roll remote from the couch roll, anendless bottom transfer felt passing around the transfer roll, saidpick-up roll being provided with a suction box extending substantiallyfrom the first point of contact of the pick-up medium with the formingwire to the rst point of contact of the pick-up medium with the bottomtransfer felt on the transfer roll, the guide roll being positioned tocause the pick-up mediurn to curve around part of the transfer rollsubstantially immediately on leaving the pick-up roll and then todiverge from the transfer felt when the web and the felt have left thetransfer roll.

6. A Fourdrinier paper-making machine comprising a couch roll, a formingwire passing over the couch roll, a suction pick-up roll, an endlesspick-up medium brought by the pick-up roll into contact with the formingwire, a suction transfer roll adjacent the pick-up roll, an endlessbottom transfer felt passing around the transfer roll, said pick-11proll being provided with a suction box extending substantially from thefirst point of contact of the pick-up medium with the forming wire tothe rst point of contact of the pick-up medium with the bottom transferfelt on the transfer roll, the guide roll being positioned to cause thepick-up medium to curve around part of the transfer roll substantiallyimmediately on leaving the pick-up roll and then to diverge from thetransfer felt when the web and the felt have left the transfer roll, andmanually controlled means to swing the pick-up roll clear from theforming wire changing of the pick-up wire when a new pick-up wire isdesired.

7. A Fourdrinier paper-making machine of the class described,comprising: a suction couch roll, a forming wire passing over part ofthe couch roll, a suction pick-up roll mounted adjacent to the couchroll, an endless permeable piek-up medium passing around part of thepick-up roll, a suction transfer roll adjacent the pick-up roll on theside of the pick-up roll remote from the couch roll, and endless .bottomtransfer felt passing around part of the transfer roll, a guide roll forsaid pick-up medium mounted -at a substantial distance from saidtransfer roll, said pick-up roll causing said pick-up medium to contactsaid forming wire `and then pass into contact with the bottom felt onthe transfer roll substantially immediately on leaving the pick-up roll,said pick-up roll being provided with a suction box extendingsubstantially from the rst point of contact of the pick-up medium withthe forming wire -to the rst point of contact of the pick-up medium withthe transfer felt on the transfer roll, the guide :roll being positionedto cause the pick-up medium to curve around part of the transfer rollsubstantially immediately on leaving the pick-up roll and then todiverge from the transfer felt when the web and the felt have left thetransfer roll, and pivoted arms to carry the pick-up roll clear from theforming wire for changing of the pick-up wire when a new pick-up wire isrequired.

8. A Fourdrinier paper-making machine comprising: a suction couch roll,a forming wire passing over part of the couch roll, a suction pick-uproll mounted adjacent to the couch roll, an endless permeable pick-upmedium passing around part of the pick-up roll, a suction transfer rolladjacent the pick-up roll on the side of the pick-up roll remote fromthe couch roll, an endless bound transfer felt passing around part ofthe transfer roll, a guide roll for said pick-up medium mounted at asubstantial distance from said transfer roll, said pick-up roll causingsaid pickup medium to contact said forming wire and then pass intocontact with the bottom felt on the transfer roll substantiallyimmediately on leaving the pick-up roll, said pick-up roll beingprovided with a suction box extending substantially from the first pointof contact of the pick-up medium with the forming wire to the rst pointof contact of the pick-up medium with the bottom transfer felt on thetransfer roll, the guide roll being positioned to cause the pick-upmedium to curve around part of the transfer roll substantiallyimmediately on leaving the pick-up roll and then to diverge from thetransfer felt when the web and the felt have left the transfer roll,pivoted arms carrying the pick-up roll, means to swing the arms clear ofthe forming wire, beams carrying the guide rolls and the arms, removablepieces supporting the beams, and further beams for insertion in themachine to support the first beams on removal -of the pieces, thuspermitting insertion of the endless pick-up medium after swinging of thepick-up roll in a position remote from the transfer roll.

9, A Fourdrinier paper-making machine of the type in which a suctionpick-up roll having an endless permeable pick-up medium passing aroundthe roll cooperates with a forming wire in the vicinity of the couchroll to remove the paper web, and a suction transfer roll disposed onthe side of the pick-up roll remote from the couch roll having a bottomtransfer felt passing over the transfer roll to receive the paper webfrom the pick-up medium and carry it to a press, comprising: a suctioncouch roll, a forming wire passing over part of the couch roll, asuction pickup roll mounted adjacent to the couch roll, an endlesspermeable pick-up medium passing around part of the pick-up roll, asuction transfer roll adjacent the pick-up roll ron the side of thepick-up roll remote from the couch roll, -an endless bottom transferfelt passing around part of the transfer roll, a guide roll for saidpick-up medium mounted at a substantial distance from said transferroll, said pick-up roll causing said pick-up medium to contact saidforming wire and then pass into contact with the bottom felt on thetransfer roll substantially immediately on leaving the pick-up roll,said pick-up roll being provided with a suction box extendingsubstantially from the first point of contact of the pick-up medium withthe forming wire to the first point of Contact ofthe pick-up medium withthe bottom transfer felt on the transfer roll, the guide roll beingpositioned to cause the pick-up medium to curve around part of thetransfer roll substantially immediately on leaving the pick-up roll andthen to diverge from the transfer felt when the web and the felt haveleft the transfer roll, the axis of the suction transfer roll being insubstantially the same horizontal plane as the axis of the pick-up rolland on the side of the pick-up roll remote from the couch roll.

l0. A Fourdrinier paper-making machine comprising a suction couch roll,a forming wire passing over part of the couch roll, a suction pick-uproll mounted adjacent to the couch roll, an endless permeable pick-upmedium passing around part of the pick-up roll, a suction transfer rolladjacent the pick-up roll on the side of the pick-up roll remote fromthe couch roll, an endless bottom transfer felt passing -around part ofthe transfer roll, a guide roll for said pick-up medium mounted at adistance from said transfer roll, said pick-up roll causing said pick-upmedium to contact said forming wire and then pass into contact with thebottom felt on the transfer roll immediately on leaving the pick-uproll, said pick-up roll being provided with a suction box extendingsubstantially from the rst point of contact of the pick-up medium withthe forming wire to the first point of contact of the pick-up mediumwith the bottom transfer felt on the transfer roll, the guide roll beingpositioned to cause the pick-up medium to curve around part of thetransfer roll substantially immediately on leaving the pick-up roll andthen to diverge from the transfer felt when the web and the felt haveleft the transfer roll, pivoted arms to carry the pick-up roll, means toswing the arms to position the pick-up roll away from the transfer roll,and means to swing the arms to control the pressure at a nip formed bythe pick-up roll and the transfer roll.

11. A Fourdrinier paper-making machine of the type in which a suctionpick-up roll having an endless permeable pick-up medium passing aroundthe roll cooperates with a forming wire in the vicinity of the couchroll to remove the paper web, and a suction transfer roll disposed onthe side of the pick-up roll remote from the couch roll having a bottomtransfer felt passing over the transfer roll to receive the paper webfrom the pick-up medium and carry it to a press, comprising: a suctioncouch roll, a forming wire passing'over part of the couch roll, asuction pick-up roll mounted adjacent to the couch roll, an endlesspermeable pick-up medium passing around part of the pick-up roll, asuction transfer roll adjacent the pick-up roll on the side of thepick-up roll remote from the couch roll, an endless bottom transfer feltpassing around part of the transfer roll, a guide roll for said pick-upmedium mounted at a distance from said transfer roll, said pick-up rollcausing said pick-up medium to contact said forming wire and then passinto contact with the bottom felt on the transferv roll substantiallyimmediately on leaving the pick-up roll, said pick-up roll beingprovided with a suction box extending substantially from the rst pointof contact of the pick-up medium with the forming wire to the rst pointof contact of the pick-up medium with the bottom transfer felt on thetransfer roll, the guide roll being positioned to cause the pick-upmedium to curve around part of the transfer roll substantiallyimmediately on leaving the pick-up roll and then to diverge from thetransfer felt when the web and the felt have left the transfer roll.

12. A Fourdrinier paper-making machine comprising a couch roll, aforming wire passing over the couch roll, a suction pick-up roll mountedadjacent to the couch roll, an endless pick-up medium brought intocontact with the forming wire by the pick-up roll, a suction transferroll disposed on the side of the pick-up roll remote from the couch rolland separated from the pick-up roll by a gap, an endless bottom transferfelt passing round the transfer roll, and guide means to cause thepick-up medium to bridge the gap between the pick-up roll and thetransfer roll to form an arc over the felt on the transfer roll and thento diverge from the transfer felt.

13. A Fourdrinier paper-making machine comprising a couch roll, aforward roll, a forming wire passing over the couch roll and the forwardroll, a suction pick-up roll and an advance guide roll mounted adjacentto the couch roll but both clear of the couch roll, an endless pick-upmedium passing round the guide roll and the pick-up roll and broughtinto contact with the forming wire between them, a suction transfer rolladjacent the pick-up roll on the side of the pickup roll remote from 10the couch roll, with a gap between the pickup roll and the transferroll, and guide means to cause the transfer felt and the pick-up mediumto diverge after the pick-up medium has bridged the gap to make contactwith the transfer felt at the transfer roll.

14. A Fourdrinier paper-making machine comprising a couch roll, aforward roll, a forming wire passing over the couch roll and the forwardroll, a suction pick-up roll and an advance guide roll mounted adjacentto the couch roll but both clear of the couch roll, an endless pick-upwire passing round the guide roll and the pickeup roll and brought intocontact with the forming wire between them, a suction transfer rolladjacent thepick-up roll on the side of the pick-up roll remote from thecouch roll, with a gap between the pick-up roll and the transfer roll,and guide means to cause the transfer felt and the pick-up wire todiverge after the pick-up wire has bridged the gap to make contact withthe transfer felt at the transfer roll. I

15. A Fourdrinier paper-making machine comprising a couch roll, aforming wire passing over the couch roll, a suction pick-up roll, aguide roll in advance of the pickup roll, both rolls being spaced fromthe couch roll, an

endless permeable pick-up medium brought into contact with the formingWire by the guide roll and the pick-up roll over an arc of the couchroll that is convex upwardly, to remove a paper web from the wire andcarry it in an arcuate path convex downwardly, a suction transfer rollwith its axis nearly at the height of the pick-up roll axis on the sideof the pick-up roll remote from the couch roll, there being a gapbetween the transfer roll and the pick-up roll, an endless bottomtransfer felt passing round the transfer roll, and guide means to causethe pick-up medium to bridge the gap between the pick-up roll and thetransfer roll, so that the medium transfers the web to the transfer feltin an arc of reverse curvature, the pick-up medium and the transfer feltdiverging when the felt has left the transfer roll with the web.

16. A Fourdrinier paper-making machine comprising a couch roll, aforming wire passing over the couch roll, a suction pick-up roll and anadvance guide roll mounted adjacent to the couch roll but both spacedfrom the forming wire at the couch roll, an endless pick-up mediumpassing round the guide roll and the pick-np roll and brought intocontact with the forming wire between them, a suction transfer rolladjacent the pick-up roll on the side of the pick-up roll remote fromthe couch roll, an endless bottom transfer felt passing round thetransfer roll, and a further guide roll to cause the pick-up medium tocurve round part of the transfer roll on leaving the pick-up roll andthen to diverge from the transfer felt when the felt has left thetransfer roll, said transfer roll being separated from the pick-up rollto provide a gap therebetween, and said pick-up medium bridging said gapas it passes from the pick-up roll to the transfer roll.

References Cited in the leof this patent UNITED' STATES PATENTSGoodwillie Nov. 16, 1954

